fix(azure-image-test): use public ssh connection
fix(azure-image-test): use public ssh connection

Artifact tests don't use sct-runner. Because jenkins builder belongs to
different virtual network, ssh connection over internal ip is not
possible - that's why it required to use public ip for ssh.

There's some instability in tests - sometimes test hangs after
restarting scylla-server. Logs don't show any reason of that and timeout
stops forcefully the test. When that happens there's no way to get
reasoning what is causing this. Increasing timeout of run might help -
maybe we'll see python traceback that possibly will lead us to the
cause.

scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests